MTZ 1220.1/1220.3
Section D. Construction and Operation
D16
The gear-cluster shaft 33 (see Fig. E-
15.1) is installed in the casing (1) and
rests in bearings (27) and (35). Gears
(32) and (34) are splined-mounted on the
shaft and locked with retaining rings. The
PTO driven pinion (31) is mounted on the
shaft in roller bearings (28) and (30).
The secondary shaft 24 (see Fig. E-
15.1) is installed in the body (1) in ta-
pered bearings (23) and (25). The bear-
ings are adjusted by shims (16), while the
position of the shaft bevel pinion relative
to the body end-face (size 15
-0.15
) is ad-
justed through selection of the adjusting
shims (21). The FDA and synchronous
PTO drive pinion (20) and the synchro-
nizer (26) boss are rigidly fixed on the
shaft. The driven pinions (17) and (19)
rest in needle bearings; the latter are
force-lubricated through the holes drilled
in the shaft. The shifting between the pin-
ions is made with the locked-on-dog fork
(18) by means of the synchronizer (26).
The dog is installed in a recess in the
casing (1) and fixed with a ball-point lock.
The sets of components on the primary,
intermediate, secondary as well as down-
shift-and –reverse gear shafts are tight-
ened up by nuts (12, 15, 47 and 50).
Transmission Gearbox Control
Mechanism
The transmission gearbox mechanism
comprises a gear-shift mechanism and a
speed-range change-over mechanism
with an electro-hydraulic system of
change-over between high “H” and lower
“L” stages of the GB reduction gear.
The gear-shift mechanism (Fig. E-15.3)
is mounted in the speed-gear assembly,
fork member (7) and the control mecha-
nism (14) cover (see Fig. E-15.1).
The cover (54) (Fig. E-15.1) houses the
dogs with shifting forks of 1
st
, 2
nd
and 5
th
,
6
th
gears fastened thereto. The dogs are
fixed in the cover with ball-point locks.
The position of forks on the dogs is ad-
justed by means of tapered screws
Fig. D-15.3. Gear-shift mechanism:
1 – fork; 2 – boot; 3 – sphere socket; 4 – spring; 5, 7 – pins; 6 – casing; 8 – cover; 9 – shaft; 11 – bolt; 12 –
bushing; 13 – cover; 14 – key; 15, 20 – levers; 16 – pick-up; 17 – screw; – 18 – washer; 19 – retaining ring
Summary of Contents for 1220.1
Page 1: ...MTZ 1220 1 1220 3 1220 1 0000010 OM OPERATOR S MANUAL 2010...
Page 161: ...MTZ 1220 1 1220 3 Section I Coupling of implements I15...
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